Differential and straight brake equalizer for rotary draw works



May 27, 1930. J, D, SPALDING ET AL v 1,760,180

DIFFERENTIAL AND STRAIGHT BRAK EQUALIZER FOR ROTARY DRAW wRKs Filed July 12. 1926 '3 Sheets-511661l l A# s M 61H01 mm1 0 May 279 i939 J. D. SPALDING ET AL I Lf@ DIFFERENTIAL AND STRAIGHT BRAKE EQUALIZER FOR ROTARY DRAW WORKS Filed July l2, 1926 3 Sheets-Sheet 2 Maly 27, J. D. SPALDQNG ET M llf DIFFERENTIAL AND STRAlGHT BRAKE EQUALIZER FOR ROTARY DRAW WORKS Filed Jly 12, 192e 3 Sheets-sheet 3 Patented 27 i@tl@ sont? nsr'atniue, or GRAFTON, rsnn'sriivamaunn anestnalosmroanre, Assrervons To THE TATTONAL Devine. Trintignant; 'or 'Los SUPPLY COMPANY OF DELA- wenn, or NEW Youri, ii. if., A CORPORATION or'nnriawartn @Erwartet-Arm STRAIGHT en nouariznn TOanoTaav naavv WORKS Applicationled July 12,

This invention relates to dierential and straightllorake equalizers for rotary dravv Works., and more particularly to anequalizing mechanism adapted for use in connection With the iinejdrum O' a rotary draw Works and `to a.

provision Voi:' 'iheans for providingboth a straight-brakemechanism. and a dierential brake mechanism i'or actuating the brake hands of rotary draw Works7 and which brake actuating mechanisms are provided with Aequalizing means fori equalizing the braking iorceimparted to the respectivehands when the mechanism is employed either as a straight loralreior asa dierential brake'. A

Duringthe'drilling o* a well; itis ,particu-i larly `advantage,ous tohave bothstraig'ht' and diiierential 'braking means tor the hoistingand lowering oit the ldrill stemfinto and zii-ovmv the Well hole-during the drilling process. in

order 'tofequalize the braking :torce imparted to the spaced brake hands provided in such a hoisting apparatus, 'it is desirable that means he provided Whichare actuated from a common point in the derriclr for applyingsimulf taneously thel braking, :tor-ce to both' of the* spaced brake hands and tor equalizing' theiorce soapplied so'that the brakes will oper.

4ate eihciently and he or long life and so-that one hand ,will not Wear'in excess of the other.

lt is therefore an object oi this invention to provide a'diiierential and straight brake actu-v 'ing a unitaiy With the di v' gle lever positioned adjacent the vloralre actu# 5' v 8 *A is' a sectional end vietv` tekenen-jf ating mechanism for use in connection with the hoisting vmechanism oi a rotary draw viorlrs, and which differential and straigt brake mechanism includes `eoiua'lizing means for equalizing the braking force or actuation which is imparted to hoth the vdead and live ends of the bra e banda Another object orn this invention is to provide a diiierential and straight-hralre mechanism in which means are provided for rendering the differential brake actuating means in operative when it is'desired to employ only the straight brake actuating means.

Another object of this invention is to' pro-- vide a din'erential and straight brake mechanism in which equalizing arel'provided ior both the dead and live ends of the hialre hands7 and which equalizing and actuating sto j means provi 192e. o seien tio.- iaisii.

ino level.

Lther objects and advantages of this invention will heapparent from the following de-` 'fneans 'are'controlled from a coin'mon operat- Figure l 1s a side elevation or" afragment of a rotary dravv Works'illustrating the hoisty ing mechanism thereof and a differential and straight brake actuating means embodying this invention.` .Y

Figure 2 is a top plan view of a dierential and straight brake mechanism embodying this invention and illustrating live ends of the brake bands as securedto the sti-aight brake actuating means.

Figure 31 is an enlarged ragmentiil front y elevation fmainly in verticalof-.the straight and di'erential brake' equalizer embodying `this :'uuvention. A s 1 Figure' e isjan end elevatio substantially oh' the; line wot Figure 3. Figure 5 1s ato pl yn viea' illustrating the n thereof-taken ediaeeounection with the" di 'erential actuating means l,embodied in this invention 'and taken substantially onjhe line Tf i' '5-5olFigure3. r f Figure .6 is a plan view ola se nd modified g form of dictamen and ses' stmk@ equa-L izer embodying thisinvention' and illustrat- Vmeansadaptedl to be connected erentifal braking means-hy afsin drum oi a rotary draw Works, which drum' 1s mountend elevation of a Y ed upon the drum shaft@ Whichbis journaledin bearings 3 secured to the posts 4: and 5,

' respectively. The drum shait 2 is driven 95 from aline shaft (notshovvn) loy any suitable manner Which is Well understood in the art. The drum l has at its opposite lends spaced hralre rims 6, upon which ahrake bandfof .anv desired' 'or preferred vconstruction is mounted.' I1 he ends 8.of 'the brake-.band hereinafter referredto yas the 'dead ends, have i' j vplatessecured thereto by any suitable means,

" such as the rivets illustrated at 10. The plates i by lmeansof a plurality of nuts 13,'all of which .construction is well understood in the art,

The 'bolts-12 are at their lower end secured to T-coupling members 14, whichcoupling '9 have formed integral therewith bosses 11- through which bolts 12' eXtend, and which bolts' 12 are secured andadjustedl in position members 1'4 .have formed at their-lowerend downwardly .extending sections "15 which. are

cored out as illustarted at 16 and through which cored sections, rocker shafts 17 are'eX-.v tended The'rocker shafts `17 are journaledl in bearings 18 which are rigidly secured to the Hoor 1 9 of the derrick in which the rotary 17 in position to prevent endwise movement of the rocker shaft 17. Keyed at the Aopposite cured to the' adjacent ends of the'rockershaft i end ofthe rocker shaft 17 are gear segments i -;Means are provided for connecting the 'live 2 1,.jwhich gear segments 21 are mounted -in position'to likewiseprevenaendwise-motion of 'therocker shaft 17.

ends Y22 of the brake band 7 wxith means "for actuating the same to'tighten the said brake .bands upon the rim 6. Any suitable means 23, y'secured tothe end of the brake'band '7, passes over the crank portion24 ofy rhcker arms 25.

lThe-rocker arm 2.5- for the right-hand brake band 8 is secured to a rod shaft 26 which isf journaled .in bearings 27 andare securedhto' the oor 19 of the dcrrick preferably in alignment with the bearings 18 by means of straps 28 soa's to', enable easy alignment of the deadl d live endsv 8 and 22 of the brake band 7.'

I ment 32 which is adapted to mesh with one of the'- gear ysegmentsYl and secured to the sleeve,

tion and adapted vto mesh with .the opposite gear segment 21.

Formed integral with'irhe sleeveshaft 30 and extending upward therefrom is a gear segment 34 and secured to the gear shaft 26 is a gearsegment 35, the 'gear segments 34 and 3 5 being mounted in position to mesikwlth a shaft 37; and lwhich operating shaft has at its lower-end extension a boss 38 which is journaled upon the rodshaft 2 6.a The. gearsege ments 34 and'35 have formed at their edges, webs- 39 which are adapted to engage the out- ;Wardly extending stops40 formed in the lower extension of the operating shaft 37 to `the necessity is secured orwhich rocker-member 25' prevent the passing of the Means are *provided` for connecting the dead gear segments 34 from o the pinion 36.

ends 8 ofthe brake bands 7 with the actuatf.

ingand equalizing mechanismv 31and'for rigidly connecting the dead ends 8of the brake bands s o that the same will not be actuated when `the equalizingv and actuating mechanism 31 is actuated, .which-means pref erably comprise the bolt-12, as heretofore speA 'ciically described, which is connected with the T-member 14 which has the lower extension 15 with the cored hole 16 formed there .v

' in in whichthe actuatingshaft 17 is mounted. The cored holev 16 is considerably larger,I

than the rocker portion of the" rocker shaftl'? l so that-the rocker portion ofthe shaft 17 may the brake band 7.

lrotate freely within the cored hole 16 without. i

of actuating the dead ends 8 of y es Means are provided for firmly securing the T-members 14 with the straight portions of the rocker shaft 17 when it isfnot desired to I.

actuate'the dead ends-8 ofthe brake bands, which means vmay be of any rdesired or preferredl construction', one' formv ofi which is illustrated asy lcomprising a pin 41- which passes through theT-member 14 landis pro# vided at its'oppositeends'with hooks' 42 which l i l are adapted to rotate over the straight ,pore

tion ofthe rocker shaft 17 so asto rigidly conneet theboltf12 with the rocker shaft'17 and tion of the shaft 17 is rotated.y f

The operation [of thisfstraiglitjanddi'erential equalizer is as follows:

rprevent movement'- thereof as the 4rocker porf .VVhen employed as a differentialbrake,

thatuis,.wi t h the hook members- 42 released,-v

the .operator grips the handle 37and pulls the same away from the drum shaft 2 so'that the rod and sleevef'shafts 26 and 30 are revolved. Thisrrotation'of the rod and-sleeve shafts .causes the crank members 24, which are secured to the respective shafts, to move to tighten the live ends 22 of the brake band .701i the rims 6 of the'drum l.f- 1f the braking 'force'A applied is unequal on either of the bands 7,the shafts 26 and 30- will .rotate relal tive 'to each other so as'to equalize the braking shaft 30 is '-a gear segment 33 which is in'posl-4 force applied. .'At -the same time that the live ends 29 arebeing actuated, the dead gagement of' the brake band at the dead'end 'so as to impart a differential braking forcev tothe brake band 7. ff the movement of the dead ends 8 vis notequal, the pinions, 21, 21, pinion 36l which is secured 'to an "operating `32\and33 will be rotated an unequalr amount so vas to retate theshafts 26y and 30relative to eachother so astogequalize the diiferential braking actions applied to the dead ends y 0f the brake' band 7'.v It will therefore he obvious from the foregoing that we have proapplied to the spacedbrakeba'nds which are employedin connection With the rotary draw Works drum.

When the brakes are employedl asa straight brake and the'hooks 42 are secured .to the straight portion ofthe crank shaft 17, the bolts 12 and hence Athe dead ends 8 of the brake bands will be'prevented from moving or Will be held rigidly so that ast-he operator moves the handle 37 in a direction away from vthe drum shaft 2, the crank members 2 twill be rotated to pull only upon the live ends 29 of the brake drums and so that when there is a difference in braking force applied to either of the brake bands 7, the shafts 26 and 30 will rotate relative to each other at the gear segvator to kickv lbrake equalizer.

Figure 6 Villustrates -a modified form of diiferential and straight braking equalizing mechanism, which is entirely similar to thatheretofore described, with the exception that the Ahooks 42a are all lsecured to a common shaft la which is journaled in bearings supported by the samebracketswhich supports the bearings 20a`and 27 and `Which shaft lla extends longitudinally with the drum shaft 2 to a point of accessibility near the operating shaft, not shown, and is provided with a handle 43a so as to permit the actuation simultaneously' of all of the hooks. 42 by actuation ofthe hand1e43a'and from a point shaft. rllhe hooks 42a, thesstraight portions of near the operating instead of gripping the crankshaft 17, grip 4the lower extensions of 'the members l5a at a shoulder all? so as to of diderential and straight a pin 45h to secured to the crank shaft 17h and which link holdlthe bolts 12a from movement when it is desired to convert the vdifferential braking 'mechanism to a straight brake equalizer.

third modified. form brake equalizer Whichdiers from the brake equalizers heretoforeset forth in the provision of an adj ustable link 45h which is pivotally secured at a crank .link 46 which is rigidly 4Figure 7 illustrates a 4,5" is pivotally secured at a pin 471 to a crank link member 48h which is rigidly securedto the shaft 26"- as illustrated in Figure? or. which may be rigidly secured to the sleeve shaft .as is tbelieved tobe obvious from the foregoing.. *ln order to permit adjustment of the link 45h. the same is Ipreferably formed in -tvvo sections, an eye-bolt section, which is pivotally secured 'at the pin et?? to the crank linlr 8b of the section .50h .into which Athe eyefboltlsection is screw-threaded and. which section Obis p'ivotally secured at the pin 4:91 to the crank link 4:6,

'l medico this modificati@ is pm'v'ided wat an Oia- Wardly extending boss 5lb which has an'arcu- `Which' apin 53h-may be inserted, and which pin 53b is carried between a pair of links 54, which are mounted upon a shaft 41h which is journaled in the vbrackets which equalizing appara-tus and j 1 ate recess 52b formed vin its uppersurface into in the modiiication of this invention shown in Figure 2.

The modifications of ourinvention herein specifically set forth are .illustratiye of the forms Which this invention may take and it .is to be understood that our invention is not limited to any of the modifications herein shown but isv for claims.

Weclaim: j l. ln a draw works brake, the combination of aA pair of spaced brake rims, brake bands mounted on the said rims,.actuating means secured to the live ends of said brakebands, vdifferential actuating meanssecured tothe .dead ends of the said brake bands, means for equalizing the said brake actuating means, and means adapted to be connected with the dead end brake band actuating means forrene dering the same inoperative.v

2; In a draw-Works brake equalizer, the

' vthe brake bands, and means operable in convnectio'n With'the dead end actuating means and adapted to 4be connected to the'same for rendering the dead end actuating meansinoperative.

of a pair of spaced brake rims, brake bands mounted on the said rims, a pair of concentric" shafts, the'inner of .which shafts extends be- 'yond the end of the outer .o'f said shafts, crank means .secured to4 theinner of said shafts beyond the end of theouterof said Y live end of one of said brake bands, crank i actuating means secured to the dead end of the said brake band, means operably connectthe v scope of the appended.

draw -Works brake, tlie`combinatijon A shafts and adapted to be connected with the 'ing the said live'end.- crank Aactuaing means f f with the dead end actuating means, crankv shaft andgadapted means secured td the outer -to be connected with therlivefendoftheopposite-of said brake bands ,lcrank actuating means adapted to be Asecured tothe dead endof the latter said brakeband, means operably connecting the outer of'said sliafts lwith the latter said' .dead and actuating'means, and

,means connected with each of said dead end v actuating means for rendeiingthe same inoperative when it operative-when .itis desired'to employ the draw Works brake actuating 'means -as a straight brake equalizer.

4Q 'Ina draw Works brake, the combination of a pair of spaced brake rims, brake bands mounted-on the said rims, a pair of concen- 1-0" tric shafts, means secured to the outer of said shafts and to the dead and live ends of oneof said brake bands, means secured to the `inner of said shafts and to the deadand live ends of the other vof said brake, bands,.a gear .segment secured to each ofthe said shafts in position to mesnwitha pinion carried `lay a common actuating' lever 'foractuating the dead'and live ends of each'of said'brake bands, and complementary stop means `se- .cured to each of the said-gear segments and tliesaid'common'a Hating lever.

. 5. Ina draw'` Works brake,/'the combination of a vpair of spaced brake rims,br`ake bands mounted on thesaid rims, actuating means. secured to the live ends of thesaid brake hands, actuating meanssecuredfto thedead ends: of said brake bands, means operably vconnecting the said actuating means Idead ends of the brake bandsandoperable of May, l1926.

reverse directionl lfrom that of the cranky means to the livev end of the second 'said brake band, and equalizingan'd actuating means connectingthesaid shaft andv sleeve shaft.r

8.' In a draWWorks brake, the-'combination o `of a pair of spaced connected brake rims,V

brake bands mounted on the rims,l difieren-s ytiallyr` operably actuating means secured to to hold-the dead ends from actuation.

' Signed-at Carnegie, Penn.,this` 1st day-of,

Jnaiga. vSigned at Torrance,lCalif., this 19tl1 day JOHN. D-SPALDiNef Y i DAVIDrS-FFAULKNER. ,Y

v '190x A with a'common actuating lever, and means adapted to beconnected With the dead end actuating means for rendering the same in- 1is desired vto employthe i draw works brake as a straight brake.

6. In `a A4dx-avwvorks brake equalizer, the combination of a pair'of spaced brake "rims,

brake bands mounted on thebrake rimsLa'cf tuating'means securedto the live'ends ofthe brake bands, actuating-meanssecured to the dead ends of1 the brake bands, the said actuating meansffo'r the live and dead ends.

tighten of the brake bands'b'eing operableto the brake `bands at one end and loosen the same to a lesser degree' at their4 equahzing means;v means connecting the equalizing meansWith the live and dead ends,

brake bandl actuating means, andmeans' adapted'to be operably connected with one of said brake band actuating brake bands, a shaft, a sleeve shaft surrounding the shaft, crank means connecting'the shaft With the live end vof one of' said brake bands, crank means operably connecting the shaft with the dead vend of the said lorakej.l

bands, the latter said crank means being operable ina direction reverse from that of the first said crank means, crank means connecting the live end of band With thev said sleeve shaft, and crank,

means operably connecting the dead end of .the second brakeiban yWith the saidA sleeve shaft, the crank mean 4to the dead end ofy the second lerake bandbeing operable in a other ends,

means for rendering the same inoperative.

7. In a draWWorks brake equalizer, the`4 combinationof a pair of spaced connected 

